.business_content .rd{
    background-image: url(/kr/network/img/rd.png);
}
.business_content .sales{
    background-image: url(/kr/network/img/sales.png);
}
.business_content .ap_support{
    background-image: url(/kr/network/img/ap_support.png);
}
.business_content .production{
    background-image: url(/kr/network/img/production.png);
}
.business_content .maintenance{
    background-image: url(/kr/network/img/maintenance.png);
}
.business_content .sales_support{
    background-image: url(/kr/network/img/sales_support.png);
}